A balance detection device for a mine crane

Abstract

The present invention relates to the technical field of cranes, and in particular to a balance detection device for a mine crane. The balance detection is carried out by detecting the difference in the supporting forces between the respective outriggers in real time, ensuring the safety of the crane and the operating personnel, and having high practicability. The device includes a plurality of grounding plates, a plurality of support cylinders, a plurality of cylinder connectors, a mounting plate, a plurality of pressure reducing valves, a plurality of high-pressure hoses, a high-pressure hard pipe, a plurality of differential pressure detection mechanisms, and a control box. The plurality of support cylinders are respectively installed on the plurality of grounding plates, the plurality of cylinder connectors are respectively installed on the plurality of support cylinders, the mounting plate is provided with a plurality of pressure reducing valves, the plurality of pressure reducing valves are respectively connected to the plurality of cylinder connectors through the plurality of high-pressure hoses. Each pressure reducing valve is provided with a plurality of oil outlets, the plurality of high-pressure hard pipes are respectively connected to the plurality of oil outlets of the plurality of pressure reducing valves and the plurality of differential pressure detection mechanisms, and the two ends of the plurality of differential pressure detection mechanisms are respectively connected to different pressure reducing valves. The plurality of differential pressure detection mechanisms are respectively connected to the control box through wires.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and particularly to a balance detection device for a mine crane. Background Art

[0002] Mine cranes generally work in the wild. During operation, the crane uses hydraulic telescopic outriggers to widen the vehicle body to improve its lifting capacity and balance. When the hydraulic outriggers are extended and supported, they are in a locked state, and the outriggers are rigidly connected to the vehicle body. In actual work, the supporting force of the hydraulic outriggers of the crane changes in real time with the working state of the crane. Often due to misoperation or overweight, etc., the crane loses balance and overturns. When the crane is working, the supporting force of one side or one outrigger increases, and the supporting force of the corresponding outrigger decreases. When the difference in the supporting force between the outriggers exceeds the critical value, the crane loses balance and overturns. Therefore, a balance detection device for a mine crane that can detect the balance state of the crane in real time is of great practicality for ensuring the safety of the crane and the operating personnel. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a balance detection device for a mine crane that performs balance detection by detecting the difference in the supporting force between each outrigger in real time, ensuring the safety of the crane and the operating personnel, and having high practicality.

[0004] A mine crane balance detection device of the present invention includes a plurality of grounding plates, a plurality of support cylinders, a plurality of cylinder connectors, a mounting plate, a plurality of pressure reducing valves, a plurality of high-pressure hoses, a high-pressure hard pipe, a plurality of differential pressure detection mechanisms and a control box. The plurality of support cylinders are respectively installed on the upper end faces of the plurality of grounding plates. The upper end faces of the plurality of support cylinders are respectively connected to the lower end faces of the plurality of legs of the crane. The plurality of cylinder connectors are respectively installed on the plurality of support cylinders, and the cylinder connectors are internally communicated with the support cylinders. A plurality of pressure reducing valves are installed on the upper end face of the mounting plate. The oil inlets of the plurality of pressure reducing valves are respectively connected to the plurality of cylinder connectors through the plurality of high-pressure hoses. Each of the plurality of pressure reducing valves is provided with a plurality of oil outlets. One ends of the plurality of high-pressure hard pipes are respectively connected to the plurality of oil outlets of the plurality of pressure reducing valves. The plurality of differential pressure detection mechanisms are installed on the mounting plate. Two ends of the plurality of differential pressure detection mechanisms are respectively connected to the other ends of the plurality of high-pressure hard pipes, and two ends of the plurality of differential pressure detection mechanisms are respectively connected to different pressure reducing valves. The plurality of differential pressure detection mechanisms are respectively connected to the control box through lines. The plurality of support cylinders are respectively installed on the lower end faces of the plurality of legs of the crane. When the legs of the crane are unfolded to support the crane, the plurality of grounding plates and the plurality of support cylinders cooperate with the plurality of legs to support the crane. When the crane is hoisting, the plurality of support cylinders are subjected to the pressure of the crane, causing the hydraulic oil pressure inside them to rise and change. The pressure enters the plurality of pressure reducing valves through the plurality of cylinder connectors and the plurality of high-pressure hoses. The plurality of pressure reducing valves reduce the input oil pressure according to a certain ratio and then input it into both ends of the plurality of differential pressure detection mechanisms through the high-pressure hard pipe. The plurality of differential pressure detection mechanisms detect the pressure difference between the two pressure reducing valves connected to them and send the pressure difference value to the control box. The control box performs crane balance detection according to the pressure difference value. When the pressure difference value detected by a certain differential pressure detection mechanism approaches the set critical value, the control box issues an alarm and prompts the unbalanced leg. The driver makes a correction operation according to the prompt to avoid the crane from tipping over, improving the safety guarantee of the crane and the operators, and having high practicability.

[0005] Preferably, it further includes a plurality of friction strips, a plurality of lower flanges and a plurality of upper flanges. A plurality of friction strips are provided on the lower end face of the grounding plate. Lower flanges are provided on the lower end faces of the plurality of support cylinders. The plurality of lower flanges are respectively fastened to the plurality of grounding plates by installing bolts. Upper flanges are provided on the upper end faces of the plurality of support cylinders. A plurality of mounting holes and threaded holes are provided on the plurality of upper flanges. Bolts pass through the mounting holes of the upper flanges to fasten the upper flanges to the lower end faces of the crane legs. The cylinder connectors are fastened to the threaded holes of the upper flanges by bolts. Through the above settings, it is convenient to install the support cylinders and increase the friction between the grounding plate and the contact surface, improving the practicability of the device.

[0006] Preferably, the oil cylinder connector further includes a connecting pipe, two ear plates, a high-pressure oil gauge, a high-pressure injection oil pipe, a pressure sensor, and a high-pressure connector. One end of the connecting pipe is installed on the port of the oil cylinder connector, and the other end of the connecting pipe is connected to the upper port of the supporting oil cylinder. Two ear plates are provided at the upper end of the oil cylinder connector. Two bolts respectively pass through the two ear plates and are fastened to the threaded holes of the upper flange. The high-pressure oil gauge is installed on the outer wall of the oil cylinder connector. A high-pressure injection oil pipe is provided on the outer wall of the oil cylinder connector. The pressure sensor is installed on the outer wall of the oil cylinder connector, and the detection head of the pressure sensor extends into the interior of the oil cylinder connector. A high-pressure connector is provided on the outer wall of the oil cylinder connector, and the high-pressure connector is connected to the pressure reducing valve through a high-pressure hose. The oil cylinder connector is internally connected to the supporting oil cylinder through the connecting pipe, so that the oil pressure inside the oil cylinder connector is communicated with the oil pressure inside the supporting oil cylinder. The pressure value inside the oil cylinder connector and the supporting oil cylinder can be understood through the high-pressure oil gauge. During maintenance, hydraulic oil is injected into the oil cylinder connector and the supporting oil cylinder through the high-pressure injection oil pipe, and the initial pressure in the supporting oil cylinder and the oil cylinder connector is adjusted. The pressure sensor detects the pressure value inside the oil cylinder connector and transmits the value to the control box. The control box calibrates the system according to the pressure values transmitted by multiple pressure sensors and assists in checking the balance, improving the practicability of the equipment.

[0007] Preferably, it further includes multiple low-pressure oil gauges, and low-pressure oil gauges are provided on all the pressure reducing valves. The pressure after equal-proportion pressure reduction by the multiple high-pressure oil gauges is understood through the low-pressure oil gauges on the multiple pressure reducing valves and compared and calibrated with the pressure values of the high-pressure oil gauges on the multiple oil cylinder connectors to determine that the input and output pressures of the pressure reducing valve are normal, improving the accuracy of the equipment.

[0008] Preferably, the differential pressure detection mechanism further includes a bottom plate, a sliding groove, two vertical plates, two small push cylinders, two springs, an induction plate, a contact plate, a position sensor, and two contact switches. A sliding groove is provided in the middle of the bottom plate. Two vertical plates are installed at both ends of the upper end surface of the bottom plate. The fixed ends of the two small push cylinders are respectively installed on the two vertical plates. The fixed ends of the two small push cylinders are respectively connected to two pressure reducing valves through two high-pressure rigid pipes. The moving ends of the two small push cylinders are respectively connected to one end of the two springs. The other ends of the two springs are respectively connected to the outer walls on both sides of the induction plate. A contact plate is provided in the middle of the upper end surface of the induction plate. The lower end of the induction plate is slidably installed in the sliding groove. The position sensor is installed on the upper end of the bottom plate and is parallel to the sliding groove. The lower end of the induction plate is in inductive contact with the position sensor. The two contact switches are respectively installed on the two vertical plates, and the contact heads of the two contact switches respectively face the two side walls of the contact plate. The pressures output by the two pressure reducing valves are delivered to the two small push cylinders through the two high-pressure rigid pipes. The two small push cylinders extend under the pressure and compress the two springs. The elongation amounts of the two small push cylinders are different due to different pressures received. The contraction amounts of the two springs are the same under the common compression of the two small push cylinders. Therefore, the two springs drive the induction plate to move along the sliding groove towards the side with lower pressure. The position sensor detects the movement of the induction plate, detects the pressure difference between the two pressure reducing valves, that is, the pressure difference between the corresponding two crane outriggers, and transmits the pressure difference value to the control box. When the movement of the induction plate causes the contact plate to contact the contact head of a contact switch, the pressure difference value reaches the set critical value. The control box starts to alarm and prompts the unbalanced outrigger, realizing mechanical crane balance detection, enabling the equipment to adapt to the harsh environment in the mining area, and improving the reliability and practicability of the equipment.

[0009] Preferably, it further includes a plurality of adjusting studs. Adjusting studs are installed on the contact heads of the plurality of contact switches, and patterns are provided on the outer walls of the plurality of adjusting studs. By rotating the adjusting studs, the distance between the contact head of the contact switch and the contact plate is adjusted to set the critical value. The alarm method of mechanical contact is more reliable than the electronic induction type and can be used in the harsh environment of the mining area.

[0010] The beneficial effects of the present invention compared with the prior art are as follows: A plurality of support cylinders are respectively installed on the lower end faces of a plurality of outriggers of a crane. When the outriggers of the crane are deployed to support the crane, a plurality of grounding plates and a plurality of support cylinders cooperate with the plurality of outriggers to support the crane. During the hoisting operation of the crane, the plurality of support cylinders are subjected to the pressure of the crane, causing the hydraulic oil pressure inside them to rise and change. The pressure enters a plurality of pressure reducing valves through a plurality of cylinder connectors and a plurality of high-pressure hoses. The plurality of pressure reducing valves reduce the input oil pressure according to a certain ratio and then input it into both ends of a plurality of differential pressure detection mechanisms through high-pressure rigid pipes. The plurality of differential pressure detection mechanisms detect the pressure difference between the two pressure reducing valves connected to them and send the pressure difference value to the control box. The control box performs the balance detection of the crane according to the pressure difference value. When the pressure difference value detected by a certain differential pressure detection mechanism approaches the set critical value, the control box issues an alarm and prompts the unbalanced outrigger. The driver makes corrective operations according to the prompt to avoid the crane from tipping over, improving the safety guarantee of the crane and the operating personnel, and having high practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the present invention;

[0012] Figure 2 is a schematic side view structure diagram of the grounding plate, the support cylinder and the cylinder connector;

[0013] Figure 3 is an enlarged structural diagram of the cylinder connector;

[0014] Figure 4 is a schematic top view structure diagram of the pressure reducing valve and the differential pressure detection mechanism;

[0015] Figure 5 is an enlarged structural diagram of the pressure reducing valve;

[0016] Figure 6 is an enlarged structural diagram of the differential pressure detection mechanism;

[0017] Reference numerals in the drawings: 1, grounding plate; 2, support cylinder; 3, cylinder connector; 4, mounting plate; 5, pressure reducing valve; 6, high-pressure hose; 7, high-pressure rigid pipe; 8, differential pressure detection mechanism; 9, control box; 10, friction strip; 11, lower flange; 12, upper flange; 13, connecting pipe; 14, ear plate; 15, high-pressure oil gauge; 16, high-pressure oil injection pipe; 17, pressure sensor; 18, high-pressure joint; 19, low-pressure oil gauge; 20, bottom plate; 21, chute; 22, vertical plate; 23, small push cylinder; 24, spring; 25, induction plate; 26, contact plate; 27, position sensor; 28, contact switch; 29, adjusting screw column. DETAILED DESCRIPTION OF THE INVENTION

[0018] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0019] Embodiment 1

[0020] A balance detection device for a mine crane, comprising a plurality of grounding plates 1, a plurality of support cylinders 2, a plurality of cylinder connectors 3, a mounting plate 4, a plurality of pressure reducing valves 5, a plurality of high-pressure hoses 6, a high-pressure hard pipe 7, a plurality of differential pressure detection mechanisms 8 and a control box 9. The plurality of support cylinders 2 are respectively installed on the upper end faces of the plurality of grounding plates 1. The upper end faces of the plurality of support cylinders 2 are respectively connected to the lower end faces of the plurality of legs of the crane. The plurality of cylinder connectors 3 are respectively installed on the plurality of support cylinders 2, and the cylinder connectors 3 are internally communicated with the support cylinders 2. The upper end face of the mounting plate 4 is provided with a plurality of pressure reducing valves 5. The oil inlets of the plurality of pressure reducing valves 5 are respectively connected to the plurality of cylinder connectors 3 through the plurality of high-pressure hoses 6. The plurality of pressure reducing valves 5 are each provided with a plurality of oil outlets. One ends of the plurality of high-pressure hard pipes 7 are respectively connected to the plurality of oil outlets of the plurality of pressure reducing valves 5. The plurality of differential pressure detection mechanisms 8 are installed on the mounting plate 4. The two ends of the plurality of differential pressure detection mechanisms 8 are respectively connected to the other ends of the plurality of high-pressure hard pipes 7, and the two ends of the plurality of differential pressure detection mechanisms 8 are respectively connected to different pressure reducing valves 5. The plurality of differential pressure detection mechanisms 8 are respectively connected to the control box 9 through lines. The plurality of support cylinders 2 are respectively installed on the lower end faces of the plurality of legs of the crane. When the legs of the crane are unfolded to support the crane, the plurality of grounding plates 1 and the plurality of support cylinders 2 cooperate with the plurality of legs to support the crane. When the crane is performing a hoisting operation, the plurality of support cylinders 2 are subjected to the pressure of the crane, causing the hydraulic oil pressure inside them to increase and change. The pressure enters the plurality of pressure reducing valves 5 through the plurality of cylinder connectors 3 and the plurality of high-pressure hoses 6. The plurality of pressure reducing valves 5 reduce the input oil pressure according to a certain ratio and then input it into both ends of the plurality of differential pressure detection mechanisms 8 through the high-pressure hard pipes 7. The plurality of differential pressure detection mechanisms 8 detect the pressure difference between the two pressure reducing valves 5 connected to them and send the pressure difference value to the control box 9. The control box 9 performs balance detection of the crane according to the pressure difference value. When the pressure difference value detected by a certain differential pressure detection mechanism 8 approaches the set critical value, the control box 9 issues an alarm and prompts the unbalanced leg, and the driver performs a correction operation according to the prompt to avoid the crane from tipping over, improving the safety guarantee of the crane and the operating personnel, and having high practicability.

[0021] Embodiment 2

[0022] A balance detection device for a mine crane, comprising a plurality of grounding plates 1, a plurality of support cylinders 2, a plurality of cylinder connectors 3, a mounting plate 4, a plurality of pressure reducing valves 5, a plurality of high-pressure hoses 6, a high-pressure rigid pipe 7, a plurality of differential pressure detection mechanisms 8 and a control box 9. The plurality of support cylinders 2 are respectively installed on the upper end faces of the plurality of grounding plates 1, and the upper end faces of the plurality of support cylinders 2 are respectively connected to the lower end faces of the plurality of legs of the crane. The plurality of cylinder connectors 3 are respectively installed on the plurality of support cylinders 2, and the cylinder connectors 3 are internally communicated with the support cylinders 2. A plurality of pressure reducing valves 5 are installed on the upper end face of the mounting plate 4. The oil inlets of the plurality of pressure reducing valves 5 are respectively connected to the plurality of cylinder connectors 3 through the plurality of high-pressure hoses 6. The plurality of pressure reducing valves 5 are each provided with a plurality of oil outlets. One ends of the plurality of high-pressure rigid pipes 7 are respectively connected to the plurality of oil outlets of the plurality of pressure reducing valves 5. The plurality of differential pressure detection mechanisms 8 are installed on the mounting plate 4. The two ends of the plurality of differential pressure detection mechanisms 8 are respectively connected to the other ends of the plurality of high-pressure rigid pipes 7, and the two ends of the plurality of differential pressure detection mechanisms 8 are respectively connected to different pressure reducing valves 5. The plurality of differential pressure detection mechanisms 8 are respectively connected to the control box 9 through lines; it further comprises a plurality of friction strips 10, a plurality of lower flanges 11 and a plurality of upper flanges 12. A plurality of friction strips 10 are provided on the lower end face of the grounding plate 1. Lower flanges 11 are provided on the lower end faces of the plurality of support cylinders 2. The plurality of lower flanges 11 are fastened to the plurality of grounding plates 1 by respectively installing bolts. Upper flanges 12 are provided on the upper end faces of the plurality of support cylinders 2. A plurality of mounting holes and threaded holes are provided on the plurality of upper flanges 12. Bolts pass through the mounting holes of the upper flanges 12 to fasten the upper flanges 12 to the lower end faces of the crane legs. The cylinder connectors 3 are fastened to the threaded holes of the upper flanges 12 by bolts; the cylinder connectors 3 further comprise a connecting pipe 13, two ear plates 14, a high-pressure oil gauge 15, a high-pressure injection pipe 16, a pressure sensor 17 and a high-pressure connector 18. One end of the connecting pipe 13 is installed on the port of the cylinder connector 3, and the other end of the connecting pipe 13 is connected to the upper port of the support cylinder 2. Two ear plates 14 are provided at the upper end of the cylinder connector 3. Two bolts respectively pass through the two ear plates 14 and are fastened to the threaded holes of the upper flange 12. The high-pressure oil gauge 15 is installed on the outer wall of the cylinder connector 3. A high-pressure injection pipe 16 is provided on the outer wall of the cylinder connector 3. The pressure sensor 17 is installed on the outer wall of the cylinder connector 3, and the detection head of the pressure sensor 17 extends into the interior of the cylinder connector 3. A high-pressure connector 18 is provided on the outer wall of the cylinder connector 3. The high-pressure connector 18 is connected to the pressure reducing valve 5 through a high-pressure hose 6; it further comprises a plurality of low-pressure oil gauges 19, and the plurality of pressure reducing valves 5 are each provided with a low-pressure oil gauge 19;The support oil cylinder 2 is conveniently installed through the lower flange 11 and the upper flange 12, and the friction between the grounding plate 1 and the contact surface is increased. The oil cylinder connector 3 is internally connected to the support oil cylinder 2 through the connecting pipe 13, so that the oil pressure inside the oil cylinder connector 3 is communicated with the oil pressure inside the support oil cylinder 2. The pressure values inside the oil cylinder connector 3 and the support oil cylinder 2 are understood through the high-pressure oil gauge 15. The pressures after proportional decompression of the multiple high-pressure oil gauges 15 are understood through the low-pressure oil gauges 19 on the multiple pressure reducing valves 5 and compared and calibrated with the pressure values of the high-pressure oil gauges 15 on the multiple oil cylinder connectors 3 to determine that the input and output pressures of the pressure reducing valve 5 are normal. The pressure sensor 17 detects the pressure value inside the oil cylinder connector 3 and transmits the value to the control box 9. The control box 9 calibrates the system according to the pressure values transmitted by the multiple pressure sensors 17 and assists in checking the balance. During maintenance, hydraulic oil is injected into the oil cylinder connector 3 and the support oil cylinder 2 through the high-pressure oil injection pipe 16, and the initial pressures in the support oil cylinder 2 and the oil cylinder connector 3 are adjusted to improve the practicability and accuracy of the equipment.;

[0023] Embodiment 3

[0024] A mine crane balance detection device includes multiple grounding plates 1, multiple support cylinders 2, multiple cylinder connectors 3, a mounting plate 4, multiple pressure reducing valves 5, multiple high-pressure hoses 6, a high-pressure rigid pipe 7, multiple differential pressure detection mechanisms 8, and a control box 9. The multiple support cylinders 2 are respectively installed on the upper end faces of the multiple grounding plates 1. The upper end faces of the multiple support cylinders 2 are respectively connected to the lower end faces of multiple legs of the crane. The multiple cylinder connectors 3 are respectively installed on the multiple support cylinders 2, and the cylinder connectors 3 are internally communicated with the support cylinders 2. Multiple pressure reducing valves 5 are installed on the upper end face of the mounting plate 4. The oil inlets of the multiple pressure reducing valves 5 are respectively connected to the multiple cylinder connectors 3 through the multiple high-pressure hoses 6. Each of the multiple pressure reducing valves 5 is provided with multiple oil outlets. One ends of the multiple high-pressure rigid pipes 7 are respectively connected to the multiple oil outlets of the multiple pressure reducing valves 5. The multiple differential pressure detection mechanisms 8 are installed on the mounting plate 4. Two ends of the multiple differential pressure detection mechanisms 8 are respectively connected to the other ends of the multiple high-pressure rigid pipes 7, and two ends of the multiple differential pressure detection mechanisms 8 are respectively connected to different pressure reducing valves 5. The multiple differential pressure detection mechanisms 8 are respectively connected to the control box 9 through wires; the differential pressure detection mechanism 8 further includes a bottom plate 20, a chute 21, two vertical plates 22, two small push cylinders 23, two springs 24, an induction plate 25, a contact plate 26, a position sensor 27, and two contact switches 28. A chute 21 is provided in the middle of the bottom plate 20. The two ends of the upper end face of the bottom plate 20 are installed with vertical plates 22. The fixed ends of the two small push cylinders 23 are respectively installed on the two vertical plates 22. The fixed ends of the two small push cylinders 23 are respectively connected to the two pressure reducing valves 5 through the two high-pressure rigid pipes 7. The moving ends of the two small push cylinders 23 are respectively connected to one ends of the two springs 24. The other ends of the two springs 24 are respectively connected to the outer walls on both sides of the induction plate 25. A contact plate 26 is provided in the middle of the upper end face of the induction plate 25. The lower end of the induction plate 25 is slidably installed in the chute 21. The position sensor 27 is installed on the upper end of the bottom plate 20, and the position sensor 27 is parallel to the chute 21. The lower end of the induction plate 25 is in inductive contact with the position sensor 27. The two contact switches 28 are respectively installed on the two vertical plates 22, and the contact heads of the two contact switches 28 respectively face the two side walls of the contact plate 26; it further includes multiple adjusting studs 29. The contact heads of the multiple contact switches 28 are all installed with adjusting studs 29, and patterns are provided on the outer walls of the multiple adjusting studs 29;Rotate the adjusting screw column 29 to adjust the distance between the contact head of the contact switch 28 and the contact plate 26, and set the critical value. The pressures output by the two pressure reducing valves 5 are delivered to the two small push cylinders 23 through the two high-pressure rigid pipes 7. The two small push cylinders 23 extend under pressure and compress the two springs 24. Since the pressures received by the two small push cylinders 23 are different, their elongation amounts are different, while the contraction amounts of the two springs 24 are the same under the combined compression of the two small push cylinders 23. Therefore, the two springs 24 drive the sensing plate 25 to move along the sliding groove 21 towards the side with lower pressure. The position sensor 27 detects the movement of the sensing plate 25, detects the pressure difference between the two pressure reducing valves 5, that is, the pressure difference between the corresponding two crane outriggers, and transmits the pressure difference value to the control box 9. When the movement of the sensing plate 25 causes the contact plate 26 to contact the contact head of a contact switch 28, the pressure difference value reaches the set critical value. The control box 9 starts to alarm and prompts the unbalanced outrigger, realizing mechanical crane balance detection, enabling the equipment to adapt to the harsh environment of the mining area and improving the reliability and practicality of the equipment.

[0025] As Figures 1 to 6 shown, when a mine crane balance detection device of the present invention is working, first, a plurality of support cylinders 2 are respectively installed on the lower end faces of a plurality of outriggers of the crane. When the outriggers of the crane are unfolded to support the crane, a plurality of grounding plates 1 and a plurality of support cylinders 2 cooperate with the plurality of outriggers to support the crane. Then, when the crane is performing a hoisting operation, the hydraulic oil pressure inside the plurality of support cylinders 2 increases and changes under the pressure of the crane. The pressure enters the plurality of pressure reducing valves 5 through the plurality of oil cylinder connectors 3 and the plurality of high-pressure hoses 6. Then, the plurality of pressure reducing valves 5 reduce the input oil pressure according to a certain ratio and input it into the plurality of small push cylinders 23 through the high-pressure rigid pipes 7. The plurality of small push cylinders 23 extend under pressure and compress the plurality of springs 24. The pressures received by the two opposite small push cylinders 23 are different, so their elongation amounts are different, while the contraction amounts of the two springs 24 are the same under the combined compression of the two small push cylinders 23. Therefore, the two springs 24 drive the sensing plate 25 to move along the sliding groove 21 towards the side with lower pressure. The plurality of position sensors 27 sense the movement of the plurality of sensing plates 25, detect the pressure difference between the plurality of pressure reducing valves 5, that is, the pressure difference between the corresponding two crane outriggers, and transmit the pressure difference value to the control box 9. Finally, when the movement of the sensing plate 25 causes the contact plate 26 to contact the contact head of a contact switch 28, the pressure difference value reaches the set critical value. The control box 9 starts to alarm and prompts the unbalanced outrigger, and the driver can perform corrective operations according to the prompt to avoid the crane from tipping over.

[0026] The main function achieved by the present invention is to perform balance detection by real-time detecting the difference in the supporting forces between each outrigger, ensuring the safety of the crane and the operating personnel, and having high practicality.

[0027] A balance detection device for a mine crane according to the present invention can be implemented by common mechanical means in terms of its installation method, connection method or setting method, as long as its beneficial effects can be achieved; the lower flange 11, upper flange 12, high-pressure oil gauge 15, high-pressure oil injection pipe 16, pressure sensor 17, low-pressure oil gauge 19, pressure reducing valve 5, contact switch 28, position sensor 27, spring 24, and small push cylinder 23 of the balance detection device for a mine crane according to the present invention are purchased on the market. Those skilled in the art only need to install and operate according to the attached user manual, without the need for creative labor from those skilled in the art.

[0028] All technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A balance detection device for a mine crane, characterized in that, It includes multiple grounding plates (1), multiple support cylinders (2), multiple cylinder connectors (3), a mounting plate (4), multiple pressure reducing valves (5), multiple high-pressure hoses (6), a high-pressure rigid pipe (7), multiple differential pressure detection mechanisms (8) and a control box (9). The multiple support cylinders (2) are respectively installed on the upper end faces of the multiple grounding plates (1). The upper end faces of the multiple support cylinders (2) are respectively connected to the lower end faces of multiple legs of the crane. The multiple cylinder connectors (3) are respectively installed on the multiple support cylinders (2). The cylinder connector (3) is internally connected to the support cylinder (2). The upper end face of the mounting plate (4) is provided with multiple pressure reducing valves (5). The oil inlets of the multiple pressure reducing valves (5) are respectively connected to the multiple cylinder connectors (3) through the multiple high-pressure hoses (6). Each of the multiple pressure reducing valves (5) is provided with multiple oil outlets. One ends of the multiple high-pressure rigid pipes (7) are respectively connected to the multiple oil outlets of the multiple pressure reducing valves (5). The multiple differential pressure detection mechanisms (8) are installed on the mounting plate (4). Two ends of the multiple differential pressure detection mechanisms (8) are respectively connected to the other ends of the multiple high-pressure rigid pipes (7), and two ends of the multiple differential pressure detection mechanisms (8) are respectively connected to different pressure reducing valves (5). The multiple differential pressure detection mechanisms (8) are respectively connected to the control box (9) through wires.

2. The balance detection device for a mine crane according to claim 1, characterized in that It further includes multiple friction strips (10), multiple lower flanges (11) and multiple upper flanges (12). Multiple friction strips (10) are provided on the lower end face of the grounding plate (1). Multiple lower flanges (11) are provided on the lower end faces of the multiple support cylinders (2). The multiple lower flanges (11) are respectively fastened to the multiple grounding plates (1) by installing bolts. Multiple upper flanges (12) are provided on the upper end faces of the multiple support cylinders (2). Multiple mounting holes and threaded holes are provided on the multiple upper flanges (12). Bolts pass through the mounting holes of the upper flange (12) to fasten the upper flange (12) to the lower end face of the crane leg. The cylinder connector (3) is fastened to the threaded hole of the upper flange (12) by a bolt.

3. The balance detection device for a mine crane according to claim 2, characterized in that The cylinder connector (3) further includes a connecting pipe (13), two ear plates (14), a high-pressure oil gauge (15), a high-pressure oil injection pipe (16), a pressure sensor (17) and a high-pressure joint (18). One end of the connecting pipe (13) is installed on the port of the cylinder connector (3), and the other end of the connecting pipe (13) is connected to the upper port of the support cylinder (2). Two ear plates (14) are provided at the upper end of the cylinder connector (3). Two bolts respectively pass through the two ear plates (14) and are fastened to the threaded holes of the upper flange (12). The high-pressure oil gauge (15) is installed on the outer wall of the cylinder connector (3). A high-pressure oil injection pipe (16) is provided on the outer wall of the cylinder connector (3). The pressure sensor (17) is installed on the outer wall of the cylinder connector (3), and the detection head of the pressure sensor (17) extends into the interior of the cylinder connector (3). A high-pressure joint (18) is provided on the outer wall of the cylinder connector (3). The high-pressure joint (18) is connected to the pressure reducing valve (5) through the high-pressure hose (6).

4. The balance detection device for a mine crane according to claim 1, characterized in that, It further includes multiple low-pressure oil gauges (19). Multiple low-pressure oil gauges (19) are provided on the multiple pressure reducing valves (5).

5. The balance detection device for a mine hoist according to claim 4, characterized in that, The differential pressure detection mechanism (8) further includes a bottom plate (20), a sliding groove (21), two vertical plates (22), two small push cylinders (23), two springs (24), an induction plate (25), a contact plate (26), a position sensor (27) and two contact switches (28). A sliding groove (21) is provided in the middle of the bottom plate (20). Vertical plates (22) are installed at both ends of the upper end surface of the bottom plate (20). The fixed ends of the two small push cylinders (23) are respectively installed on the two vertical plates (22). The fixed ends of the two small push cylinders (23) are respectively connected to the two pressure reducing valves (5) through two high-pressure rigid pipes (7). The moving ends of the two small push cylinders (23) are respectively connected to one ends of the two springs (24). The other ends of the two springs (24) are respectively connected to the outer walls on both sides of the induction plate (25). A contact plate (26) is provided in the middle of the upper end surface of the induction plate (25). The lower end of the induction plate (25) is slidably installed in the sliding groove (21). The position sensor (27) is installed on the upper end of the bottom plate (20). The position sensor (27) is parallel to the sliding groove (21). The lower end of the induction plate (25) is in inductive contact with the position sensor (27). The two contact switches (28) are respectively installed on the two vertical plates (22). The contact heads of the two contact switches (28) are respectively aligned with the two side walls of the contact plate (26).

6. The mine crane balance detection device according to claim 5, characterized in that, It further includes a plurality of adjusting studs (29). Adjusting studs (29) are installed on the contact heads of the plurality of contact switches (28). Patterns are provided on the outer walls of the plurality of adjusting studs (29).

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